This actually did nearly happen to me (stupidly on my part). I had signed up for a blood draw and forgot to eat before it was time. As I sat there it became more and more difficult to breathe (like you I’m assuming it was from lack of oxygen), i didn’t realize why. Everything was graying out and sounds were becoming dimmer. Another donator noticed I was extremely pale, like absolutely no color, and called the staff over. I had to rest for about an hour and eat before I could leave and of course was told to take it easy. I never really realized just HOW much blood they take from you until I saw the bags, kind of crazy.
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